Failed to open gpio chip on Ubuntu Core 24 / Raspberry Pi 5

[jpm-canonical]

Beta version of snap, following Wiki:

$ sudo snap install matter-pi-gpio-commander --beta
matter-pi-gpio-commander (beta) 2.0.0 from Canonical IoT Labs installed
$ sudo snap set matter-pi-gpio-commander gpio=4
$ sudo snap connect matter-pi-gpio-commander:gpio-memory-control
error: snap "matter-pi-gpio-commander" has no plug named "gpio-memory-control"
$ sudo matter-pi-gpio-commander.test-blink
GPIO: 4
GPIOCHIP: 0
Failed to open gpio chip: /dev/gpiochip0

Release version of snap following docs:

$ sudo snap remove matter-pi-gpio-commander --purge
matter-pi-gpio-commander removed
$ sudo snap install matter-pi-gpio-commander
matter-pi-gpio-commander 1.1.0 from Canonical IoT Labs installed
$ sudo snap set matter-pi-gpio-commander gpio=4
$ sudo snap connect matter-pi-gpio-commander:gpio-memory-control
$ sudo matter-pi-gpio-commander.test-blink
GPIO: 4
Oops: Unable to determine board revision from /proc/cpuinfo
 -> No "Hardware" line
 ->  You'd best google the error to find out why.

Beta version following #60 - these steps work on Ubuntu Server 24.04 on Raspberry Pi 5, but not when using Core 24:

$ sudo snap remove matter-pi-gpio-commander --purge
matter-pi-gpio-commander removed
$ sudo snap install matter-pi-gpio-commander --beta
matter-pi-gpio-commander (beta) 2.0.0 from Canonical IoT Labs installed
$ sudo snap set matter-pi-gpio-commander gpiochip=4
$ sudo matter-pi-gpio-commander.test-blink
Unset or empty environment variable: GPIO
$ sudo snap set matter-pi-gpio-commander gpio=4
$ sudo matter-pi-gpio-commander.test-blink
GPIO: 4
GPIOCHIP: 4
Failed to open gpio chip: /dev/gpiochip4

---

System info

$ ls /dev/gpio*
/dev/gpiochip0  /dev/gpiochip2  /dev/gpiochip4  /dev/gpiomem1  /dev/gpiomem3
/dev/gpiochip1  /dev/gpiochip3  /dev/gpiomem0   /dev/gpiomem2  /dev/gpiomem4
$ cat /proc/cpuinfo 
processor	: 0
BogoMIPS	: 108.00
Features	: fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm lrcpc dcpop asimddp
CPU implementer	: 0x41
CPU architecture: 8
CPU variant	: 0x4
CPU part	: 0xd0b
CPU revision	: 1

processor	: 1
BogoMIPS	: 108.00
Features	: fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm lrcpc dcpop asimddp
CPU implementer	: 0x41
CPU architecture: 8
CPU variant	: 0x4
CPU part	: 0xd0b
CPU revision	: 1

processor	: 2
BogoMIPS	: 108.00
Features	: fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm lrcpc dcpop asimddp
CPU implementer	: 0x41
CPU architecture: 8
CPU variant	: 0x4
CPU part	: 0xd0b
CPU revision	: 1

processor	: 3
BogoMIPS	: 108.00
Features	: fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm lrcpc dcpop asimddp
CPU implementer	: 0x41
CPU architecture: 8
CPU variant	: 0x4
CPU part	: 0xd0b
CPU revision	: 1

Revision	: d04170
Serial		: <redacted>
Model		: Raspberry Pi 5 Model B Rev 1.0

[jpm-canonical]

Manually connection for gpio worked:

$ sudo matter-pi-gpio-commander.test-blink
GPIO: 4
GPIOCHIP: 4
Failed to request output line.
Permission denied
$ sudo snap connect matter-pi-gpio-commander:custom-gpio matter-pi-gpio-commander:custom-gpio-dev 
$ sudo matter-pi-gpio-commander.test-blink
GPIO: 4
GPIOCHIP: 4
Setting GPIO 4 to Off
Setting GPIO 4 to On
Setting GPIO 4 to Off
Setting GPIO 4 to On
^C

Assertion file: https://pastebin.canonical.com/p/NpqPcyv3Jr/